Infrared Characterization of Composite Materials

The infrared properties of the composite materials were characterized according to standard protocols.^25,26,42 (link) The total infrared reflectance and transmittance spectra were obtained by using a Frontier Fourier transform infrared (FTIR) spectrometer (PerkinElmer) outfitted with a mid-infrared integrating sphere (Pike Technologies) and were analyzed with the Spectrum (PerkinElmer) and Origin 8.5 (OriginLab) software packages. The measurements were referenced to a National Institute of Standards and Technology (NIST)-verified Pike Technologies Diffuse Gold Standard. The composite materials were mounted on home-built size-adjustable stages, which allowed for the application of strains between 0% and 100%. The total reflectance spectra were collected at an illumination angle of 12°, and the total transmittance spectra were collected at a normal illumination angle. The spectra were collected in an indoor environment at room temperature, i.e., typically ∼20 °C. The average reflectance and transmittance value changes were calculated for the composites over the wavelength range of 4.5–16.5 μm by subtracting the average values at strains of 0% from the average values at strains of >0%. The experiments were performed on at least eight different composite materials of each type, with similar results obtained in each instance.

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Liu P., Leung E.M., Badshah M.A., Moore C.S, & Gorodetsky A.A. (2023). Structure–function relationships for squid skin-inspired wearable thermoregulatory materials. APL Bioengineering, 7(4), 046111.

Publication 2023

Frontier Fourier transform infrared (FTIR) spectrometer mid-infrared integrating sphere Origin 8.5

Gold Illumination Pike Strains

Corresponding Organization :

Other organizations : University of California, Irvine, Chapman University

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Variable analysis

independent variables

Strain applied to the composite materials (between 0% and 100%)

dependent variables

Total infrared reflectance spectra
Total infrared transmittance spectra

control variables

Illumination angle for reflectance spectra (12°)
Illumination angle for transmittance spectra (normal)
Room temperature (typically ~20 °C)
Measurement environment (indoor)

controls

NIST-verified Pike Technologies Diffuse Gold Standard used as a reference for the measurements

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